Fluid handling – Systems – Supply and exhaust
Patent
1978-04-10
1980-03-25
Cohen, Irwin C.
Fluid handling
Systems
Supply and exhaust
91447, 91451, 91454, F58
Patent
active
041945328
ABSTRACT:
A valve controls fluid flow to a fluid jack by movement of a single valve spool to a first position. A check valve and bypass valve cooperate to pass fluid exhausted from the fluid jack to a tank bypassing the single valve spool. Movement of the bypass valve is controlled by developing a controlled pressure drop between the fluid in the fluid jack and the fluid between the check valve and the single valve spool in response to the valve spool being moved to a second position.
REFERENCES:
patent: 2554930 (1951-05-01), Ulinski
patent: 2644429 (1963-07-01), Waterman et al.
patent: 3136226 (1964-06-01), Gratzmuller
patent: 3439583 (1969-04-01), Stacey
patent: 3654835 (1972-04-01), Stevenpiper
patent: 3818802 (1974-06-01), Wilson
patent: 3902401 (1975-09-01), Allen et al.
patent: 3906838 (1975-09-01), Hofer
Caterpillar Tractor Co.
Cohen Irwin C.
Grant John W.
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